fix: export logs error

[chrisleekr]

Description

Related Issue

#561

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (f1cb3e7) compared to base (1ff6ac5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #567   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           92        92           
  Lines         3421      3423    +2     
  Branches       576       576           
=========================================
+ Hits          3421      3423    +2     

Impacted Files	Coverage Δ
...ntend/webserver/handlers/grid-trade-logs-export.js	100.00% <100.00%> (ø)
app/server-frontend.js	100.00% <100.00%> (ø)
app/server.js	100.00% <100.00%> (ø)

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